<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
<!--    <transition-group name="breadcrumb">-->
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span v-if="item.redirect === 'noRedirect'"
              class="no-redirect">{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
<!--    </transition-group>-->
  </el-breadcrumb>
</template>

<script setup>
const route = useRoute();
const router = useRouter();
const levelList = ref([])

function getBreadcrumb() {
  // only show routes with meta.title
  let matched = route.matched.filter(item => item.meta && item.meta.title);
  const first = matched[0]
  // 判断是否为首页
  // if (!isDashboard(first)) {
  //   matched = [{ path: '/index', meta: { title: '首页' } }].concat(matched)
  // }

  let temp = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
      .map(item => {
        //过滤脏数据，只取需要的
        return {meta: item.meta, path: item.path, redirect: item.redirect}
      })
  if (temp.length > 0) {
    levelList.value = temp;
    try {
      localStorage.setItem('levelList',JSON.stringify(levelList.value))
    }catch (e){
      //console.error('.......地址缓存失败');
    }
  }else{
    levelList.value = JSON.parse(localStorage.getItem('levelList'));
  }
}

function isDashboard(route) {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.trim() === 'Index'
}

function handleLink(item) {
  const {redirect, path} = item
  if (redirect) {
    router.push(redirect)
    return
  }
  router.push(path)
}

watchEffect(() => {
  // if you go to the redirect page, do not update the breadcrumbs
  if (route.path.startsWith('/redirect/')) {
    return
  }
  getBreadcrumb()
})
getBreadcrumb();
</script>

<style lang='scss' scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>